JURASSIC AND TRIASSIC BRACHIOPODA. 223 



This shell, which is covered with spines, was found by Mr. J. F. Walker in the Bradford 

 Clay of Tetbury Road, near Cirencester (' Proceedings of the Yorkshire Naturalists' Club,' 

 p. 214, 1869, and ' Geol. Mag.,' 1870). It has also been found by Prof. Seeley in the 

 Bradford Clay of Bradford, Wiltshire. 



234. Rhynchonella Crossi, Walker, Sup., PI. XXVII, fig. 17. 



Rhynchonella Ceossi, Walker. Proceedings of the Yorkshire Naturalist Cluh 



p. 214, 1869 ; and Geol. Mag., vol. vii, p. 562^ 

 18/0. 



Shell small, wider than long, or somewhat transversely oval. Dorsal valve rather deeper 

 and more convex than the opposite one, and ornamented with from thirteen to fifteen 

 strong radiating ribs of which three or four form a slightly raised mesial fold. Ventral 

 valve divided by a moderately deep sinus, occupied by two or three longitudinal ribs, 

 with six or seven on each of the lateral portions of the valve. A variable number 

 of spines rise at unequal intervals from the upper edge of each rib. The valves are 

 closely and concentrically striated. Beak small, foramen concealed under its incurved 

 extremity. 



Length 4, width 5, depth 3 lines. 



05s. — This species can be distinguished from Bh. spinosa by its small dimensions, 

 and few strong ribs. It was discovered by the Rev. E. Cross in the Inferior Oolite 

 (Lincolnshire Limestone) of Appleby, near Brigg, Lincolnshire, and subsequently by 

 Mr. J. F. Walker in the same formation at Brough, near Hull, in Yorkshire. Mr. S. 

 Sharp has also mentioned having found it in the shelly beds of Ponton, in his paper on 

 the Oolites of Northamptonshire, published in the ' Quarterly Journal of the Geological 

 Society,' vol. xxix, p. 265, 1873. It is stated by Professor Judd to occur in several 

 localities ; see his valuable Memoir on the " Geology of Rutlandshire/' ' Geological 

 Survey,' 1875. 



235. Rhynchonella senticosa, Von Buch. Dav., Ool. Mon., p. 73, PI. XV, fig. 21. 



Nothing new. It occurs in the Inferior Oolite at Bradford Abbas, Crewkerne 

 Station, and in some other places in Dorset and Somersetshire, where it is rare. 



